CN114717380A - Supersonic secondary combustion oxygen lance for improving converter steel scrap ratio - Google Patents
Supersonic secondary combustion oxygen lance for improving converter steel scrap ratio Download PDFInfo
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- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 189
- 239000001301 oxygen Substances 0.000 title claims abstract description 189
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 129
- 229910000831 Steel Inorganic materials 0.000 title abstract description 13
- 239000010959 steel Substances 0.000 title abstract description 13
- 230000008602 contraction Effects 0.000 claims description 14
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 9
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 238000009628 steelmaking Methods 0.000 abstract description 8
- 230000035515 penetration Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000003723 Smelting Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000007903 penetration ability Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
本发明提供一种提高转炉废钢比的超音速二次燃烧氧枪，属于冶金转炉炼钢技术领域。该氧枪枪头的前端设置主氧喷管，枪头的侧壁设置有超音速二次燃烧副氧喷管，副氧喷管供氧流量占总供氧流量的5％～20％，超音速二次燃烧副氧喷管为拉瓦尔喷管结构，包括收缩段、稳定段及扩张段，副氧喷管的设计马赫数为1.4～2.5，扩张段出口形状为圆形、椭圆或方形，副氧喷管与水平方向夹角为20°～70°，所有副氧喷管均匀分布在氧枪侧壁同一水平高度位置。该方法能够保证超音速二次燃烧副氧喷管所形成的二次燃烧副氧射流具有更强的气流穿透性，提高二次燃烧副氧射流与炉内一氧化碳的反应接触面积，提高炉内温度，降低炉内补热剂消耗，实现提高转炉废钢比加入量的目的。
The invention provides a supersonic secondary combustion oxygen lance for improving the waste steel ratio of a converter, and belongs to the technical field of metallurgical converter steelmaking. The front end of the oxygen lance head is provided with a main oxygen nozzle, and the side wall of the gun head is provided with a supersonic secondary combustion auxiliary oxygen nozzle. The oxygen supply flow of the auxiliary oxygen nozzle accounts for 5% to 20% of the total oxygen supply flow. The secondary oxygen nozzle of sonic secondary combustion is a Laval nozzle structure, including a constriction section, a stable section and an expansion section. The design Mach number of the secondary oxygen nozzle is 1.4 to 2.5, and the shape of the outlet of the expansion section is round, ellipse or square. The included angle between the auxiliary oxygen nozzles and the horizontal direction is 20° to 70°, and all the auxiliary oxygen nozzles are evenly distributed at the same level on the side wall of the oxygen lance. The method can ensure that the secondary combustion secondary oxygen jet formed by the supersonic secondary combustion secondary oxygen nozzle has stronger airflow penetration, improve the reaction contact area between the secondary combustion secondary oxygen jet and the carbon monoxide in the furnace, and improve the furnace interior. temperature, reduce the consumption of heat supplement in the furnace, and achieve the purpose of increasing the specific amount of scrap steel added to the converter.
Description
技术领域technical field
本发明涉及冶金转炉炼钢技术领域，特别是指一种提高转炉废钢比的超音速二次燃烧氧枪。The invention relates to the technical field of metallurgical converter steelmaking, in particular to a supersonic secondary combustion oxygen lance for improving the waste steel ratio of the converter.
背景技术Background technique
顶底复吹转炉炼钢法是目前国内主要的炼钢方法，其终点钢水主要由高温铁水及冷料废钢获取。目前，国内钢铁行业受碳减排与雾霾治理等政策制约，高炉铁水总产量管控日益严格，导致国内转炉冶炼原料来源大幅受限。The top-bottom double blowing converter steelmaking method is currently the main steelmaking method in China, and its final molten steel is mainly obtained from high-temperature molten iron and cold scrap. At present, the domestic steel industry is constrained by policies such as carbon emission reduction and smog control, and the total production of blast furnace molten iron is increasingly controlled, resulting in a significant limitation of the source of domestic converter smelting raw materials.
冷料废钢作为钢铁工业的绿色资源，可进行循环利用，具有较高的节能环保价值。在铁水量相对固定的情况下，提高转炉冶炼废钢比，可降低环境污染，提高炼钢产量，减少二氧化碳排放，实现废钢资源的高效循环利用。但过高的废钢比会导致转炉炼钢过程中炉内热源不足，影响终点钢水的产品质量与生产过程的经济效益。As a green resource in the iron and steel industry, cold scrap steel can be recycled and has high energy saving and environmental protection value. Under the condition that the amount of molten iron is relatively fixed, increasing the ratio of scrap steel in converter smelting can reduce environmental pollution, increase steelmaking output, reduce carbon dioxide emissions, and achieve efficient recycling of scrap steel resources. However, an excessively high scrap ratio will lead to insufficient heat source in the furnace during the converter steelmaking process, which will affect the product quality of the final molten steel and the economic benefits of the production process.
为进一步提高转炉废钢比，基于二次燃烧方法为主要保温手段的转炉炼钢热补偿技术被国内炼钢工作者广泛研究，并大量应用于转炉实际生产过程中。二次燃烧核心技术手段是通过二次燃烧副氧喷管对转炉内部通入附加氧气，将吹炼时炉内产生的一氧化碳燃烧成二氧化碳，利用该过程放出的大量热能，强化冶金熔池上方高温炉气的保温效果。该技术资金投入占比低，可快速达到炉膛内温度的整体与稳定升高，实现提高转炉废钢比的目的。In order to further improve the scrap ratio of converters, the heat compensation technology of converter steelmaking based on the secondary combustion method as the main heat preservation method has been widely studied by domestic steelmaking workers, and has been widely used in the actual production process of converters. The core technical means of secondary combustion is to introduce additional oxygen into the converter through the secondary combustion auxiliary oxygen nozzle, and burn the carbon monoxide generated in the furnace into carbon dioxide during the blowing process. Insulation effect of furnace gas. This technology has a low proportion of capital investment, and can quickly achieve the overall and stable increase of the temperature in the furnace, and achieve the purpose of increasing the scrap ratio of the converter.
目前，现有转炉二次燃烧氧枪均采用低速供氧模式，二次燃烧喷嘴采用单一直管结构或多直管结构简单链接，所形成的二次燃烧副氧射流容易被高速主氧射流与炉内炉气涡流团影响，导致二次燃烧副氧射流的穿透效果被大幅抑制，削弱了二次燃烧用氧气利用效率。因此，现有二次燃烧氧枪的技术指标难以满足转炉废钢比大幅提升的生产需求。At present, the existing converter secondary combustion oxygen lances all adopt the low-speed oxygen supply mode, and the secondary combustion nozzles adopt a single straight pipe structure or a simple connection of multiple straight pipe structures, and the formed secondary combustion secondary oxygen jet is easily affected by the high-speed main oxygen jet. Influenced by the furnace gas swirl mass in the furnace, the penetration effect of the secondary oxygen jet of the secondary combustion is greatly suppressed, which weakens the oxygen utilization efficiency for the secondary combustion. Therefore, it is difficult for the technical indicators of the existing secondary combustion oxygen lance to meet the production demand for the substantial increase in the scrap ratio of the converter.
发明内容SUMMARY OF THE INVENTION
本发明要解决的技术问题是提供一种提高转炉废钢比的超音速二次燃烧氧枪，采用超音速二次燃烧副氧喷管结构对附加氧气进行投送，强化二次燃烧副氧射流初始动能，增强二次燃烧副氧射流的穿透能力，提高二次燃烧副氧射流与炉内一氧化碳的氧化反应的接触面积，促进了炉内一氧化碳的燃烧反应速率，进而提升了转炉炉内整体温度，实现提高转炉废钢比加入量的目的。The technical problem to be solved by the present invention is to provide a supersonic secondary combustion oxygen lance for improving the scrap ratio of the converter, which adopts the supersonic secondary combustion secondary oxygen nozzle structure to deliver additional oxygen and strengthens the initial stage of the secondary combustion secondary oxygen jet. The kinetic energy can enhance the penetration ability of the secondary combustion secondary oxygen jet, increase the contact area between the secondary combustion secondary oxygen jet and the oxidation reaction of carbon monoxide in the furnace, and promote the combustion reaction rate of carbon monoxide in the furnace, thereby increasing the overall temperature in the converter furnace. , to achieve the purpose of increasing the amount of scrap steel added to the converter.
该氧枪在二次燃烧氧枪枪头的前端设置主氧喷管，在二次燃烧氧枪枪头的侧壁设置超音速二次燃烧副氧喷管，The oxygen lance is provided with a main oxygen nozzle at the front end of the secondary combustion oxygen lance tip, and a supersonic secondary combustion secondary oxygen nozzle is arranged on the side wall of the secondary combustion oxygen lance tip,
其中，超音速二次燃烧副氧喷管为拉瓦尔喷管结构，超音速二次燃烧副氧喷管包括收缩段、稳定段及扩张段，超音速二次燃烧副氧喷管的设计马赫数为1.4～2.5。Among them, the supersonic secondary combustion auxiliary oxygen nozzle is a Laval nozzle structure, the supersonic secondary combustion auxiliary oxygen nozzle includes a constriction section, a stable section and an expansion section, and the design Mach number of the supersonic secondary combustion auxiliary oxygen nozzle is 1.4 to 2.5.
上述超音速二次燃烧副氧喷管由内而外依次设置为收缩段、稳定段和扩张段，收缩段占超音速二次燃烧副氧喷管总长度的20～35％，稳定段占超音速二次燃烧副氧喷管总长度的5～10％，扩张段占超音速二次燃烧副氧喷管总长度的55～75％。The above-mentioned supersonic secondary combustion auxiliary oxygen nozzles are sequentially arranged from the inside to the outside into a contraction section, a stable section and an expansion section, the contraction section accounts for 20-35% of the total length of the supersonic secondary combustion auxiliary oxygen nozzle, and the stable section accounts for the supersonic secondary combustion. The total length of the auxiliary oxygen nozzle is 5-10%, and the expansion section accounts for 55-75% of the total length of the auxiliary oxygen nozzle of the supersonic secondary combustion.
收缩段的收缩半锥角为15～30°，所述扩张段的扩张半锥角为3～12°。The contraction half-cone angle of the contraction section is 15-30°, and the expansion half-cone angle of the expansion section is 3-12°.
扩张段出口形状为圆形、椭圆或方形等。The shape of the outlet of the expansion section is a circle, an ellipse or a square.
超音速二次燃烧副氧喷管与水平方向夹角为20°～70°。The angle between the supersonic secondary combustion auxiliary oxygen nozzle and the horizontal direction is 20° to 70°.
超音速二次燃烧副氧喷管的数量根据转炉吨位的不同设计为4～8个，所有超音速二次燃烧副氧喷管均匀分布在氧枪侧壁同一水平高度位置。The number of supersonic secondary combustion auxiliary oxygen nozzles is designed to be 4 to 8 according to the tonnage of the converter, and all supersonic secondary combustion auxiliary oxygen nozzles are evenly distributed at the same level of the oxygen lance side wall.
根据转炉吨位的不同，超音速二次燃烧副氧喷管出口中心与主氧喷管出口中心在喷头轴向间距为80mm～250mm。Depending on the tonnage of the converter, the axial spacing of the nozzle between the center of the supersonic secondary combustion secondary oxygen nozzle and the center of the main oxygen nozzle is 80mm to 250mm.
二次燃烧副氧喷管氧气流量占总供氧流量的5％～20％，所述主氧喷管氧气流量占总供氧流量的80％～95％。The oxygen flow of the secondary combustion auxiliary oxygen nozzle accounts for 5% to 20% of the total oxygen supply flow, and the oxygen flow of the main oxygen nozzle accounts for 80% to 95% of the total oxygen supply flow.
本发明的上述技术方案的有益效果如下：The beneficial effects of the above-mentioned technical solutions of the present invention are as follows:
上述方案中，可抑制高速主氧射流与炉内炉气涡流团对二次燃烧副氧射流的不利影响，强化二次燃烧副氧射流的穿透能力，提升二次燃烧副氧射流的氧气利用效率，增加炉内一氧化碳的二次燃烧率，大幅提高转炉废钢比。本发明可达成，二次燃烧副氧射流穿透能力提高13％以上，二次燃烧副氧射流需供氧量下降15％以上，炉内一氧化碳二次燃烧率提高25％以上，转炉废钢比提高20％以上。In the above scheme, the adverse effects of the high-speed main oxygen jet and the furnace gas vortex mass in the furnace on the secondary combustion secondary oxygen jet can be suppressed, the penetrating ability of the secondary combustion secondary oxygen jet can be strengthened, and the oxygen utilization of the secondary combustion secondary oxygen jet can be improved. efficiency, increase the secondary combustion rate of carbon monoxide in the furnace, and greatly improve the scrap ratio of the converter. The invention can achieve that the penetrating ability of the secondary oxygen jet of secondary combustion is increased by more than 13%, the oxygen supply required by the secondary oxygen jet of secondary combustion is decreased by more than 15%, the secondary combustion rate of carbon monoxide in the furnace is increased by more than 25%, and the waste steel ratio of the converter is improved. 20% or more.
附图说明Description of drawings
图1为本发明实施例1中的提高转炉废钢比的超音速二次燃烧氧枪的正视示意图；Fig. 1 is the front view schematic diagram of the supersonic secondary combustion oxygen lance that improves the converter scrap ratio in the embodiment of the
图2为本发明实施例1中的提高转炉废钢比的超音速二次燃烧氧枪副氧喷管的局部放大正视示意图；Fig. 2 is the partial enlarged front view schematic diagram of the auxiliary oxygen nozzle of the supersonic secondary combustion oxygen lance for improving the converter scrap ratio in the embodiment of the
图3为本发明实施例1中的提高转炉废钢比的超音速二次燃烧氧枪的俯视示意；Fig. 3 is the top view schematic diagram of the supersonic secondary combustion oxygen lance that improves the converter scrap ratio in the embodiment of the
图4为本发明实施例2中的提高转炉废钢比的超音速二次燃烧氧枪的正视示意图；Fig. 4 is the front view schematic diagram of the supersonic secondary combustion oxygen lance that improves the converter scrap ratio in the embodiment of the
图5为本发明实施例2中的提高转炉废钢比的超音速二次燃烧氧枪副氧喷管的局部放大正视示意图；Fig. 5 is the partial enlarged front view schematic diagram of the auxiliary oxygen nozzle of the supersonic secondary combustion oxygen lance that improves the scrap ratio of the converter in the
图6为本发明实施例2中的提高转炉废钢比的超音速二次燃烧氧枪的俯视示意。FIG. 6 is a schematic plan view of the supersonic secondary combustion oxygen lance for improving the scrap ratio of the converter in Example 2 of the present invention.
其中：1-氧枪枪头；2-主氧喷管；3-副氧喷管；3’-收缩段；3”-稳定段；3”’-扩张段。Among them: 1- oxygen lance tip; 2- main oxygen nozzle; 3- auxiliary oxygen nozzle; 3'-contraction section; 3"-stable section; 3"'-expansion section.
具体实施方式Detailed ways
为使本发明要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实施例进行详细描述。In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.
本发明提供一种提高转炉废钢比的超音速二次燃烧氧枪。The invention provides a supersonic secondary combustion oxygen lance for improving the scrap ratio of the converter.
该氧枪在二次燃烧氧枪枪头的前端设置主氧喷管，在二次燃烧氧枪枪头的侧壁设置超音速二次燃烧副氧喷管，The oxygen lance is provided with a main oxygen nozzle at the front end of the secondary combustion oxygen lance tip, and a supersonic secondary combustion secondary oxygen nozzle is arranged on the side wall of the secondary combustion oxygen lance tip,
其中，超音速二次燃烧副氧喷管为拉瓦尔喷管结构，超音速二次燃烧副氧喷管包括收缩段、稳定段及扩张段，超音速二次燃烧副氧喷管的设计马赫数为1.4～2.5。Among them, the supersonic secondary combustion auxiliary oxygen nozzle is a Laval nozzle structure, the supersonic secondary combustion auxiliary oxygen nozzle includes a constriction section, a stable section and an expansion section, and the design Mach number of the supersonic secondary combustion auxiliary oxygen nozzle is 1.4 to 2.5.
超音速二次燃烧副氧喷管由内而外依次设置为收缩段、稳定段和扩张段，收缩段占超音速二次燃烧副氧喷管总长度的20～35％，稳定段占超音速二次燃烧副氧喷管总长度的5～10％，扩张段占超音速二次燃烧副氧喷管总长度的55～75％。The supersonic secondary combustion auxiliary oxygen nozzles are sequentially arranged from the inside to the outside into a contraction section, a stable section and an expansion section. The contraction section accounts for 20-35% of the total length of the supersonic secondary combustion auxiliary oxygen nozzles, and the stable section accounts for the supersonic secondary combustion. The total length of the oxygen nozzle is 5-10%, and the expansion section accounts for 55-75% of the total length of the secondary oxygen nozzle of the supersonic secondary combustion.
收缩段的收缩半锥角为15～30°，所述扩张段的扩张半锥角为3～12°。The contraction half-cone angle of the contraction section is 15-30°, and the expansion half-cone angle of the expansion section is 3-12°.
扩张段出口形状为圆形、椭圆或方形。The outlet shape of the expansion section is circular, oval or square.
超音速二次燃烧副氧喷管与水平方向夹角为20°～70°。The angle between the supersonic secondary combustion auxiliary oxygen nozzle and the horizontal direction is 20° to 70°.
超音速二次燃烧副氧喷管的数量为4～8个，所有超音速二次燃烧副氧喷管均匀分布在氧枪侧壁同一水平高度位置。The number of supersonic secondary combustion secondary oxygen nozzles is 4 to 8, and all supersonic secondary combustion secondary oxygen nozzles are evenly distributed at the same level of the oxygen lance side wall.
超音速二次燃烧副氧喷管出口中心与主氧喷管出口中心在喷头轴向间距为80mm～250mm。The distance between the outlet center of the secondary oxygen nozzle of the supersonic secondary combustion and the center of the main oxygen nozzle outlet in the axial direction of the nozzle is 80mm to 250mm.
二次燃烧副氧喷管氧气流量占总供氧流量的5％～20％，所述主氧喷管氧气流量占总供氧流量的80％～95％。The oxygen flow of the secondary combustion auxiliary oxygen nozzle accounts for 5% to 20% of the total oxygen supply flow, and the oxygen flow of the main oxygen nozzle accounts for 80% to 95% of the total oxygen supply flow.
下面结合具体实施例予以说明。The following description will be given in conjunction with specific embodiments.
实施例1Example 1
本实施例应用在100吨转炉常规冶炼过程中，如图1、图2和图3所示，该氧枪在二次燃烧氧枪枪头1的前端设置主氧喷管2，在二次燃烧氧枪枪头的侧壁设置超音速二次燃烧副氧喷管3，This embodiment is applied in the conventional smelting process of a 100-ton converter. As shown in Figure 1, Figure 2 and Figure 3, the oxygen lance is provided with a
其中，超音速二次燃烧副氧喷管3为拉瓦尔喷管结构，超音速二次燃烧副氧喷管3包括收缩段3’、稳定段3”及扩张段3”’，超音速二次燃烧副氧喷管的设计马赫数为1.4。Among them, the supersonic secondary combustion
超音速二次燃烧副氧喷管的收缩段、稳定段与扩张段分别占超音速二次燃烧副氧喷管总长度的22％、6％及72％，超音速二次燃烧副氧喷管的收缩段和扩张段半锥角分别为27°和4°，超音速二次燃烧副氧喷管出口形状为圆形，二次燃烧副氧喷管与水平方向夹角为60°，4个超音速二次燃烧副氧喷管均匀分布在氧枪侧壁同一水平高度位置，超音速二次燃烧副氧喷管出口中心与主氧喷管出口中心在喷头轴向间距设计为90mm，二次燃烧副氧喷管氧气流量占总供氧流量的8％，主氧喷管氧气流量占总供氧流量的92％。The constricted section, stable section and expansion section of the supersonic secondary combustion auxiliary oxygen nozzle account for 22%, 6% and 72% of the total length of the supersonic secondary combustion auxiliary oxygen nozzle, respectively. The semi-cone angles of the contraction section and expansion section are 27° and 4°, respectively. The outlet shape of the supersonic secondary combustion auxiliary oxygen nozzle is circular, and the angle between the secondary combustion auxiliary oxygen nozzle and the horizontal direction is 60°. The supersonic secondary combustion auxiliary oxygen nozzles are evenly distributed at the same level on the side wall of the oxygen lance. The oxygen flow of the combustion auxiliary oxygen nozzle accounts for 8% of the total oxygen supply flow, and the oxygen flow of the main oxygen nozzle accounts for 92% of the total oxygen supply flow.
采用本发明的超音速二次燃烧氧枪后，二次燃烧副氧射流穿透能力提高24％，二次燃烧副氧射流需供氧量下降20％，炉内一氧化碳二次燃烧率提高29％，转炉废钢比提高26％。After the supersonic secondary combustion oxygen lance of the invention is adopted, the penetrating capacity of the secondary oxygen jet of secondary combustion is increased by 24%, the oxygen supply required by the secondary oxygen jet of secondary combustion is reduced by 20%, and the secondary combustion rate of carbon monoxide in the furnace is increased by 29% , the converter scrap ratio increased by 26%.
实施例2Example 2
本实施例应用在250吨转炉脱磷冶炼过程中，如图4、图5和图6所示，该氧枪在二次燃烧氧枪枪头1的前端设置主氧喷管2，在二次燃烧氧枪枪头的侧壁设置超音速二次燃烧副氧喷管3，This embodiment is applied in the dephosphorization smelting process of a 250-ton converter. As shown in Figure 4, Figure 5 and Figure 6, the oxygen lance is provided with a
其中，超音速二次燃烧副氧喷管3为拉瓦尔喷管结构，超音速二次燃烧副氧喷管3包括收缩段3’、稳定段3”及扩张段3”’，超音速二次燃烧副氧喷管的设计马赫数为2.0，超音速二次燃烧副氧喷管的收缩段、稳定段与扩张段分别占超音速二次燃烧副氧喷管总长度的30％、9％及61％，超音速二次燃烧副氧喷管的收缩段和扩张段半锥角分别为20°和9°，超音速二次燃烧副氧喷管出口形状为方形，二次燃烧副氧喷管与水平方向夹角为40°，6个超音速二次燃烧副氧喷管均匀分布在氧枪侧壁同一水平高度位置，超音速二次燃烧副氧喷管出口中心与主氧喷管出口中心在喷头轴向间距设计为210mm，二次燃烧副氧喷管氧气流量占总供氧流量的15％，主氧喷管氧气流量占总供氧流量的85％。Among them, the supersonic secondary combustion
采用本发明的超音速二次燃烧氧枪后，二次燃烧副氧射流穿透能力提高55％，二次燃烧副氧射流需供氧量下降34％，炉内一氧化碳二次燃烧率提高42％以上，转炉废钢比提高37％。After the supersonic secondary combustion oxygen lance of the present invention is adopted, the penetrating capacity of the secondary combustion secondary oxygen jet is increased by 55%, the oxygen supply required by the secondary combustion secondary oxygen jet is reduced by 34%, and the secondary combustion rate of carbon monoxide in the furnace is increased by 42% Above, the converter scrap ratio is increased by 37%.
通过实施例1和实施例2可知，使用本发明设计的一种提高转炉废钢比的超音速二次燃烧氧枪在不同吨位转炉与冶炼工况中，可有效提高二次燃烧副氧射流穿透能力，增大二次燃烧副氧射流的氧气利用率，促进炉内一氧化碳的二次燃烧效果，达到提高转炉废钢比的目的。It can be seen from Example 1 and Example 2 that the supersonic secondary combustion oxygen lance designed by the present invention to improve the scrap ratio of converters can effectively improve the penetration of secondary combustion secondary oxygen jets in converters and smelting conditions of different tonnages. It can increase the oxygen utilization rate of the secondary combustion secondary oxygen jet, promote the secondary combustion effect of carbon monoxide in the furnace, and achieve the purpose of improving the scrap ratio of the converter.
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明所述原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.
Claims (8)
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| CN115852083A (en) * | 2022-12-08 | 2023-03-28 | 北京科技大学 | A low-carbon system and method for high-efficiency top-bottom double-blowing carbon dioxide secondary combustion of converters |
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| CN201535631U (en) * | 2009-08-26 | 2010-07-28 | 鞍钢股份有限公司 | Double-flow oxygen lance nozzle |
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